The similar sound to a kettle boiling coming from your boiler could be down to something called kettling. A boiler operates by heating hot water via a heat exchanger. When the water flow is restricted as it is trapped in the heat exchanger it becomes too hot and starts to steam, boil and therefore expand..
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Step 1. Firstly, shut down the power to the boiler. The noise is more often than not due to “kettling”, which is simply the term used to describe a chugging noise .